Abstract
Super-knock, which occurs under low-speed and big load operate condition in turbo-charged gasoline direct injection (TGDI) engine, is an abnormal combustion phenomenon. Due to its potential to cause degradation of the engine, super knock has become the main obstacle for increasing specific power and lowing fuel consumption of engine. In order to investigate suppress strategies of super-knock, split injection is applied on a high boosted GDI engine. The results shows that: super knock correlates to some extent with split injection; further study shows that appropriate split injection duty ratio and the end of second injection time could reduce super knock effectively.
Highlights
With the energy crisis and environment pollution spreading all over the world, the technology that gasoline direct injection combine with turbo charger, as an important measure to reduce fuel consumption and improve emission of engine, is developed rapidly
The results shows that: super knock correlates to some extent with split injection; further study shows that appropriate split injection duty ratio and the end of second injection time could reduce super knock effectively
An abnormal combustion phenomenon has been found in highly boosted SI engine, especially in turbo-charged gasoline direct injection (TGDI) engine, which is termed as super knock (Volkswagen calls it Super Knock [1], AVL names it Mega-Knock[2] and Pre-Ignition in IFP[3])
Summary
With the energy crisis and environment pollution spreading all over the world, the technology that gasoline direct injection combine with turbo charger, as an important measure to reduce fuel consumption and improve emission of engine, is developed rapidly. An abnormal combustion phenomenon has been found in highly boosted SI engine, especially in turbo-charged gasoline direct injection (TGDI) engine, which is termed as super knock (Volkswagen calls it Super Knock [1], AVL names it Mega-Knock[2] and Pre-Ignition in IFP[3]),. Christoph Dahnz[5] from KIT University proves that hot spot, which is widely believed as the cause for super knock, locating in combustion chamber randomly not the particular place, on the other hand, points out super knock maybe result in the interaction between fuel and oil droplets from wall by fuel inject splash. Akram Zahdeh[6] reduces super knock frequency substantially using split injection on a TGDI engine. Split injection strategy will be carried on a TGDI engine to restrain super knock, especially the end of second injection time (EOI) and the ratio of second injection (ROI) will be studied carefully
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